Abstract: A method and a system to facilitate differentiated levels of service in a network-based marketplace are described. The system may include a transaction monitor to monitor activity of a user with respect to a network-based marketplace; a status generator to generate a status within the network-based marketplace, for the user based at least partially on the monitored activity; and a user service module to provide service within the network-based marketplace to the user in accordance with the determined status of the user. Users may achieve a preferred user status within the network-based marketplace. A preferred user may receive preview listings of items that are not available to users who did not achieve a preferred user status. A preferred user may also receive personalized customer service within the network-based marketplace.

Abstract: A method of allowing a seller in an auction facility to offer buyers the option of buying an offering at a pre-auction seller determined price or using a regular auction process. If a buyer is given the option to purchase at the seller determined price and decides to use the regular auction process by submitting a bid, the option to buy the offering at a pre-auction seller determined price is discontinued.

Abstract: Methods and apparatuses for detecting fraudulent activities made over a network-based transaction facility using a machine. In responsive to a first event with respect to the network-based transaction facility and initiated under a first user identity from the machine which is coupled to the network-based transaction facility via a network, the method causes a first identifier associated with the first user identity to be stored on the machine. In responsive to a second event with respect to the network-based transaction facility and initiated under a second user identity from the machine, the method causes a detecting of a potentially fraudulent activity by detecting a lack of correspondence between the first identifier stored on the machine and a second identifier associated with the second user identity.